//
//  NSDictionary+SY.h
//  SanYiTeaching
//
//  Created by 郑浩然 on 2019/5/23.
//  Copyright © 2019年 SanYi. All rights reserved.
//

#import <Foundation/Foundation.h>

@interface NSDictionary (SY)
- (id)nilObjectForKey:(NSString *)key;
@end
